Lean muscle mass refers to the amount of muscle on your body minus the fat. It's the portion of muscle that is non-fatty, functional, and metabolically active. Having more lean muscle:
- Speeds up your metabolism since muscle burns more calories than fat
- Helps you burn more calories even at rest
- Gives you strength, endurance, and energy
- Supports functional movement and prevents injury
- Contributes to an athletic, toned appearance
- Promotes healthy aging as we tend to lose muscle as we get older
- Mostly water, protein, glycogen
- Metabolically active
- Burns calories
- Functional - allows movement
- Shape changes with training
- Mostly adipose tissue
- Metabolically inactive
- Stores calories
- Less functional, slows movement
- Shape less responsive to training
- Strength training with weights/resistance
- Getting enough protein in your diet
- Allowing proper recovery between workouts
- High intensity interval training (HIIT)
- Compound exercises working multiple joints/muscle groups
- Sex - men tend to have more muscle than women
- Genetics and body type
- Goals - athletic performance vs aesthetics
- Age - muscle tends to decrease with age